(At the time there was a book called The Black Art of ... Assembly? I can't recall, and I should be flogged for forgetting it... Probably not the book you're t

(At the time there was a book called The Black Art of ... Assembly? I can't recall, and I should be flogged for forgetting it... Probably not the book you're thinking of, but Michael Abrash's Graphics Programming Black Book was a mix of reprinted old articles and new content that had a bunch of highly optimized (for 486) graphics routines. IIRC there was a 9-cycle-per-texel texture mapping routine.